You're half right. I got confused and I've added the FVA (historic sounds) to the skinpack and the ISI Marussia mod uses FISIR sounds. The mod uses the appropriate sounds but you need to have installed the ISI Marussia mod or the Formula Master ISI mod.

McLaren skin without chrome. Sorry, but i can't set normal alpha level there.

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Np mate. I just asked because could be related to settings in my pc. Perhaps, if you facing modding problems with this issue, you could contact someone of F1RT mod team. Their Mclaren skin doesn´t seems chrome in my system too as real mclaren but it is a lot reflexive skin.
Cheers.